165665755 has 8 divisors (see below), whose sum is σ = 200767824. Its totient is φ = 131220000.

The previous prime is 165665749. The next prime is 165665779. The reversal of 165665755 is 557566561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165665755 - 2⁵ = 165665723 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163521 + ... + 164530.

It is an arithmetic number, because the mean of its divisors is an integer number (25095978).

Almost surely, 2^165665755 is an apocalyptic number.

165665755 is a deficient number, since it is larger than the sum of its proper divisors (35102069).

165665755 is a wasteful number, since it uses less digits than its factorization.

165665755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328157.

The product of its digits is 945000, while the sum is 46.

The square root of 165665755 is about 12871.1209690532. The cubic root of 165665755 is about 549.2173496262.

The spelling of 165665755 in words is "one hundred sixty-five million, six hundred sixty-five thousand, seven hundred fifty-five".